Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fbac413a2589051…

MALICIOUS

PDF

103.6 KB Created: 2021-08-06 16:12:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: acc1fa997513bcedb631dbed7fd5c155 SHA-1: d1186095cbf25e023f7e0d38d7ab1391f684db6f SHA-256: 4fbac413a2589051c2b5b71ea29557a8bf5f619e765be2d4d2dd6181409b8ff4
192 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

This PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document employs urgency and callback lures, common in phishing and scam campaigns. It contains numerous links to external PDFs hosted on compromised CMS uploads and disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious content, likely a phishing page or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://5m-tti.com/uploads/image/files/desegibugunijigenovasa.pdf In PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609e911254582---dixebezawijawubul.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077a377e63e5---zesixumorivozokazajep.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc9c9b3382---kijeloluvewaz.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/99435ec78c0b9131c2851460e3228f6b/kawedifobogizeno.pdfIn PDF document text
    • https://tennis94.fr/img/pics/files/kowezozefi.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bca77d5b2e3---76669674566.pdfIn PDF document text
    • https://cpsguffanti.com/uploads/file/fosegurusiko.pdfIn PDF document text
    • http://leguido.net/files/72668719191.pdfIn PDF document text
    • https://demetraproject.eu/ckfinder/userfiles/files/xiparibox.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/6fcd816f799f233b7d716cd923cb997a/fimogotufapetumu.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/75554980555.pdfIn PDF document text
    • http://cwesp.biz/upload/file/4931801668.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///watakuwazawusetozami.pdfIn PDF document text
    • https://x-software.cz/data/file/85229840135.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/2dfb2425472f8d3e6f2f6cf5f37a5f9f/10625678921.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/ekc1jj80nii185gu9cd6l37oej/suzuvebi.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/nifekoliwidepixulazuzo.pdfIn PDF document text
    • https://aquatrustfina.com/userfiles/file/5157892956.pdfIn PDF document text
    • https://www.corpeverest.com/ckfinder/userfiles/files/zarelubu.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/25097290332.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/65030c3df2da637a71b7d383c36ad4ee/pewipanilixakotejaj.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/3b86943963e8071b242e509cf10998da/74055198039.pdfIn PDF document text
    • https://carlojans.com/cms/file/15007889036.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/e7u1fid2f03trap9nc6n2acljo/pivolemerikenisifuxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=mr+cooper+loan+payoff+instructionsPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000130eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130EB 10680 bytes
SHA-256: fa7498ad35d4a7de221077eb50d8df0c3f5068b1831c73886ee93f51eabd6d1d
font_01_sfnt_off00014990.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14990 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000161a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161A2 17608 bytes
SHA-256: 9ad983956a8aa2a9ec4d1cd0f369006cdb85ad7778d4bb4657c8613622ced86e

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